Reference MVI56E-GSC/GSCXT ♦ CompactLogix or MicroLogix Platform
User Manual Enhanced Generic ASCII Serial Communication Module
Page 90 of 140 ProSoft Technology, Inc.
April 24, 2017
4.4 Special Function Blocks
Special function blocks are special blocks used to control the module or request
special data from the module. The current version of the software supports three
special function blocks:
1 Warm Boot block
2 Cold Boot block
3 Configuration Data block
4.4.1 Block 9998: Warm Boot
This block is sent from the ControlLogix processor to the module (output image)
when the module is required to perform a warm-boot (software reset) operation.
This block is commonly sent to the module any time configuration data
modifications are made in the controller tags data area. This will cause the
module to read the new configuration information and to restart. To Warm Boot
the module, place a value of - 2 in the first byte of the output image (where the
Block Sequence Number would normally go).
4.4.2 Block 9999: Cold Boot
This block is sent from the ControlLogix processor to the module (output image)
when the module is required to perform the cold boot (hardware reset) operation.
This block is sent to the module when a hardware problem is detected by the
ladder logic that requires a hardware reset. To Cold Boot the module, place a
value of - 3 in the first byte of the output image (where the Block Sequence
Number would normally go).
4.4.3 Configuration Data Transfer Block
When the module performs a restart operation, it will request configuration
information from the ControlLogix processor. This data is transferred to the
module in a specially formatted Write Block (output image). The module will
request the configuration block by setting the Block Sequence Number in the
Read Block (input image) to a value of -1. Refer to the MVI56E-GSC
Configuration (page 48) section of this manual for a description of the data
objects used with the blocks and the ladder logic required. The format of the
configuration block is shown below:
Port 1
To Next Page
Loading...